package com.example.filter;

import com.alibaba.fastjson.JSON;
import com.example.domain.ResponseResult;
import com.example.domain.entity.LoginUser;
import com.example.enums.AppHttpCodeEnum;
import com.example.utils.JwtUtil;
import com.example.utils.RedisCache;
import com.example.utils.WebUtils;
import io.jsonwebtoken.Claims;
import org.apache.poi.util.StringUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Objects;

//@Component
//public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {
//    @Autowired
//    private RedisCache redisCache;
//
//    @Override
//    protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) throws ServletException, IOException {
//        //获取请求头的信息
//        String token = httpServletRequest.getHeader("token");
//        if(!StringUtils.hasText(token)){
//            //没有token，该接口不需要登录，直接放行
//            filterChain.doFilter(httpServletRequest,httpServletResponse);
//        }
//
//        //解析获取userID
//        Claims claims=null;
//        try {
//            claims= JwtUtil.parseJWT(token);
//        } catch (Exception e) {
//            e.printStackTrace();
//            //token 可能超时 或 非法
//            ResponseResult result = ResponseResult.errorResult(AppHttpCodeEnum.NEED_LOGIN);
//            WebUtils.renderString(httpServletResponse, JSON.toJSONString(result));
//            return;
//        }
//
//        //从redis中获取用户信息
//        String userId=claims.getSubject();
//        LoginUser loginUser=redisCache.getCacheObject("bloglogin"+userId);
//        //存入securityContextHolder
//        UsernamePasswordAuthenticationToken authenticationToken=new UsernamePasswordAuthenticationToken(loginUser,null,null);
//
//    }
//}

@Component
public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {

    @Autowired
    private RedisCache redisCache;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
        //获取请求头中的token
        String token = request.getHeader("token");
        if (!StringUtils.hasText(token)) {
            //说明该接口不需要登录  直接放行
            filterChain.doFilter(request, response);
            return;
        }
        //解析获取userid
        Claims claims = null;
        try {
            claims = JwtUtil.parseJWT(token);
        } catch (Exception e) {
            e.printStackTrace();
            //token超时  token非法
            //响应告诉前端需要重新登录
            ResponseResult result = ResponseResult.errorResult(AppHttpCodeEnum.NEED_LOGIN);
            WebUtils.renderString(response, JSON.toJSONString(result));
            return;
        }
        String userId = claims.getSubject();
        //从redis中获取用户信息
        LoginUser loginUser = redisCache.getCacheObject("bloglogin:" + userId);
        //如果获取不到
        if (Objects.isNull(loginUser)) {
            //说明登录过期  提示重新登录
            ResponseResult result = ResponseResult.errorResult(AppHttpCodeEnum.NEED_LOGIN);
            WebUtils.renderString(response, JSON.toJSONString(result));
            return;
        }
        //存入SecurityContextHolder
        UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(loginUser, null, null);
        SecurityContextHolder.getContext().setAuthentication(authenticationToken);

        filterChain.doFilter(request, response);
    }
}

